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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ab88448ae2c2b1ac4dc03ccceb586bcb4e8c2fca136a66d01c3b3463ff337b' 
  AND token = '20P15Nz9hxlzjGufuIIaggNZqh3i2AcWizd7cNaZ13s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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