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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85176505efb480e8ffb1c9345507d45430f4e13c1d539f43bfd643aef1d4b2b2' 
  AND token = '62fSJb+3x+ayFf7uNkZ2ctKnaLJsUga0IajuIHEJ5vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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