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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69cad67a695616d2c55c5edf22d345a9880123549495701d72cb9add3bd7b44' 
  AND token = 'np7JW1iGCU/OeLP2dpdBmKfpJf1IhyXnG4AN2pR796I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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