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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf773e50e87014c47fb250d4f3c45b8f6e77971e0fd66cd91e822189b60c1b0' 
  AND token = 'a80sGjLc3Z2uZyLrkbA+l+FDVyABFPTP2agnZGVYExo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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