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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73aa05c89b29e12af399a6a96b63136bdeea34ee53968e63f0c3be00d67d16b9' 
  AND token = '6fz8pOAMupIElOTHE8WO2EfKi/rSffnFTWB6OlAkNSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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