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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ae8062a1040a1d3d4c081d91288e5a8c660fe74c813bd845d878baa00f9f0b' 
  AND token = 'kQlgQPhjEBvI0b4KTqH/D3JKW8Ogat2XHL07ELmFtWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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