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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b946912a053e1cd75e2e61489d1587e6975bbcf876776b14dc1f1b59bd9f1949' 
  AND token = 'KU9aCIm0bKx2IAaA72pOSyfmJZp9+Xin6BQqVi/wTkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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