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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ea7af839a883fde86f3fbc2dfc1dd6ae2ef2a30605684b391d7e7c11bd44d8' 
  AND token = 'hKXZCks4IONRw9jpDTEbB3Cg76gLxxjDK99w0UUxNbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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