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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c610a6b4a13a63dce9e5aebaa1924e83aa021f681856b0904be0c85ca910ea46' 
  AND token = '3NiREchGdil70I2NV6l6mFgzDVnakngJGUkrcMlRQH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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