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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbcc6de1e9ebac721b0825088e10cefce0ef7b474ac8f9eb41e6f413b4d5b5d' 
  AND token = '97wr7I/Gf4+f3aEVv8T4hvkETPn7jUFkPfF37cSBG1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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