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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd3942c494a7d4c39724dd87c814256f207f7dc1e278487b70cfe095159e877' 
  AND token = 'ilj8ZN7JigLoSSGd5O+eUIgXFGytCiiPcU5/ArreelQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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