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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f670c01ba7237b6ca08e182962367250d99345876cc70ca69107f77f3d1fd8c2' 
  AND token = 'SXFt5e+jdcBol55o/PIWbNx/CMMzlh1TvvfpYrCVxE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00192

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}