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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a5340a74883c34e556617946e8178580609530958dab060d3594f47f33cc28' 
  AND token = 'wuMXdWaiSjmp/bamPS5yEYPF7kT6pxls9XC5zwyupfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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