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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fee88fb12bab9519ab83f4a05573d123d87a600abf606de65604aa8dc9093c2' 
  AND token = 'wVAIpbruxd3icpsNQFL8NCa8027dpOKu2g8r8OAc6b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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