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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbe49891d0791687af246a63a7c72ab702d2817c9a6b0371f9dd3484493a579' 
  AND token = '2DXbo9Vb/UK+uUodPgL9CMRooxAARZt1jpE/Bx3IGdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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