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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb1b8e592e07884362b3f5e979cf04aa3c4e667572d8ab0e579af5de5482de8' 
  AND token = 'eK0A+3hP1hzkVm9KlxH900qrPmvatP2uv/aXaBHKMXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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