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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d898a2194931f2b77d09b2cf321ccd5c80e4df906f8c276e0710076edd1ef15' 
  AND token = 'J0B9Si+x6vDB0exb+QX5J6HgZlvxMMbtfYB/jYbDUdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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