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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a1f585b44bd891dd9f94a31f5481650f23f70d051286e592e507c7eb0ead88' 
  AND token = 'L3G1oWs3llvCeg7PGw4JqJb2NcWo8Pjbp4yhzIP6tHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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