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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0101e56739751c0c624371b799c9ee0e38b4a5093d6eadfdab3c68b2f271159' 
  AND token = 'R5frBwZL3f2+qU+u1PseradC5QLCPK4woThBPOcdI40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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