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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9346d4b2c6d6e7d190fcbe4c0d0c93b4d449c4735f0ec0258dbf64584a1605a4' 
  AND token = 'M9n9HuF/Ihw8b4KkiQ8swIXuiOcgXDLRz5pmPoZvx7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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