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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d664fc7206d4861116f3e266229e010eb4e302ffa1e0ca97d75c224292079a' 
  AND token = 'Peg+lbw+eBMunf/ASq4fiUFCDFKWFA0iIexZ7YjPDHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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