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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df298840884ae927e3162ca3d1eb747ee48dcafe9c27f0e2e312c1603b1a223c' 
  AND token = '36osqpGE+5yWkFpyoYWYU3OtGv9CG/kCDoDmxY/3kNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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