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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707e78dffc54b515675b273dfee911887d87d970f06002178fb08b9464a7df91' 
  AND token = 'kA7cOesJytUW3fPPIcJBqnz0ABDh1n2Y4IdDW18gUKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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