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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff16ac350f290a395a7764d0a9e413bbb72a936ccfd40fc1157612214c8cff48' 
  AND token = 'etZLMO1dGopFYf5Nlzdad+j2lyzNaXT505QjqB1uA1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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